Display devices having an antiglare layer providing reduced sparkle appearance

Abstract

Display devices and antiglare layers that minimize glare and the appearance of sparkle are described. One type of display device includes a pixel substrate, having a pixel array, and an antiglare layer. The antiglare layer has a surface roughness with a spatial frequency such that a typical focal length of the antiglare layer is either at least four times larger than an optical distance between a surface of the array of pixels and the antiglare layer, or at least three times smaller than the optical distance between the surface of the array of pixels and the antiglare layer. In some embodiments, a pixel pitch of the array of pixels is less than 120 μm. In some embodiments, the antiglare layer may have a power spectral density that is elliptical, with a minor axis of the power spectral density aligned with a color direction of the array of pixels.

Description

[0001]This application claims the benefit of priority under 35 U.S.C. §119 of U.S. Provisional Application Ser. No. 61 / 712,000 filed on Oct. 10, 2012 the content of which is relied upon and incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field[0003]The present specification generally relates to display devices having an antiglare layer and, more particularly, to display devices having an antiglare layer that minimizes both glare and the appearance of sparkle.[0004]2. Technical Background[0005]The presence of glare is a significant issue in display devices, particularly when the display devices are viewed outdoors or in a brightly lit environment. Accordingly, some display devices utilize an anti-reflective coating on the front surface of the display to eliminate reflections from the front face of the display. However, use of only an anti-reflective coating may be insufficient because a significant amount of light remains reflected by the various layers that are i...

AI Technical Summary

Problems solved by technology

The presence of glare is a significant issue in display devices, particularly when the display devices are viewed outdoors or in a brightly lit environment.

However, use of only an anti-reflective coating may be insufficient because a significant amount of light remains reflected by the various layers that are inside the display device itself.

However, as the resolution of display devices increases, particularly display devices used in handheld electronic devices, pixel pitch of the array of pixels is significantly shrinking.

However, higher spatial frequencies create significant haze and decreases image contrast.

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